Convert Caveats test to spec.

Library/Homebrew/test/caveats_spec.rb

+require "formula"
+require "caveats"
+
+describe Caveats do
+  subject { described_class.new(f) }
+  let(:f) { formula { url "foo-1.0" } }
+
+  specify "#f" do
+    expect(subject.f).to eq(f)
+  end
+
+  describe "#empty?" do
+    it "returns true if the Formula has no caveats" do
+      expect(subject).to be_empty
+    end
+
+    it "returns false if the Formula has caveats" do
+      f = formula do
+        url "foo-1.0"
+
+        def caveats
+          "something"
+        end
+      end
+
+      expect(described_class.new(f)).not_to be_empty
+    end
+  end
+end

Library/Homebrew/test/caveats_test.rb

-require "testing_env"
-require "formula"
-require "caveats"
-
-class CaveatsTests < Homebrew::TestCase
-  def setup
-    super
-    @f = formula { url "foo-1.0" }
-    @c = Caveats.new @f
-  end
-
-  def test_f
-    assert_equal @f, @c.f
-  end
-
-  def test_empty?
-    assert @c.empty?
-
-    f = formula do
-      url "foo-1.0"
-
-      def caveats
-        "something"
-      end
-    end
-    c = Caveats.new f
-
-    refute c.empty?
-  end
-end